Return-Path: Sender: (Marvin Kaye) To: lml Date: Tue, 25 Mar 2003 13:20:37 -0500 Message-ID: X-Original-Return-Path: Received: from [128.102.31.31] (HELO mail.arc.nasa.gov) by logan.com (CommuniGate Pro SMTP 4.1b1) with ESMTP id 2086094 for lml@lancaironline.net; Tue, 25 Mar 2003 13:10:52 -0500 Received: from [143.232.221.83] (reinath.arc.nasa.gov [143.232.221.83]) by mail.arc.nasa.gov (8.9.3/8.9.3) with ESMTP id KAA17121 for ; Tue, 25 Mar 2003 10:10:51 -0800 (PST) Mime-Version: 1.0 X-Sender: mreinath@mail.arc.nasa.gov X-Original-Message-Id: X-Original-Date: Tue, 25 Mar 2003 10:10:49 -0800 X-Original-To: lml@lancaironline.net From: "Mike S. Reinath" Subject: Substituting GPS for DME Content-Type: text/plain; charset="us-ascii" ; format="flowed" I have been trying to understand the AIM guidelines for substituting GPS for DME. My GPS is an en route and terminal IFR GPS (Apollo GX 65). One of the restrictions says (AIM 1-1-43): "Charted requirements for ADF and/or DME can be met using the GPS system, except for use as the principal instrument approach navigation source." It seems fairly clear that I can substitute GPS for DME during the en route and terminal phase of the flight. Where I am unclear is for the approach. For example, can I use my GPS as a substitute for DME (I do not have a DME receiver) for a VOR DME approach (assuming that I can load the fix from the data base, have a procedure if the RAIM occurs, etc.)? I am thinking yes, because the GPS is not the principal navigation source. Can anyone clear this up for me? Thanks. Mike Reinath 360 Std. Build N3602M